Investigation of the Axial Stiffness of a Bolt Using a Three-Dimensional Finite Element Model

Zadoks, R.I.; Kokatam, Durga Prasad Rao

doi:10.1006/jsvi.2001.3651

Cited by 20 publications

(8 citation statements)

References 2 publications

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“…(See [85] for an example.) Very finely meshed, quasistatic FE analysis of joints can lend insight into joint mechanics, but fine meshes are impractical for direct use in structural dynamics modeling, typically requiring impractically small time steps [86].…”

Section: Introductionmentioning

confidence: 99%

Handbook on dynamics of jointed structures.

Ames¹,

Lauffer²,

Jew³

et al. 2009

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The problem of understanding and modeling the complicated physics underlying the action and response of the interfaces in typical structures under dynamic loading conditions has occupied researchers for many decades. This handbook presents an integrated approach to the goal of dynamic modeling of typical jointed structures, beginning with a mathematical assessment of experimental or simulation data, development of constitutive models to account for load histories to deformation, establishment of kinematic models coupling to the continuum models, and application of finite element analysis leading to dynamic structural simulation. In addition, formulations are discussed to mitigate the very short simulation time steps that appear to be required in numerical simulation for problems such as this. This handbook satisfies the commitment to DOE that Sandia will develop the technical content and write a Joints Handbook. The content will include: (1) Methods for characterizing the nonlinear stiffness and energy dissipation for typical joints used in mechanical systems and components. (2) The methodology will include practical guidance on experiments, and reduced order models that can be used to characterize joint behavior. (3) Examples for typical bolted and screw joints will be provided. 3 AcknowledgmentThe authors thank the many managers and members of technical staff who have worked on this challenging problem at various times since its inception. For all of them, this involved a tremendous amount of hard work and for our management team it involved taking a substantial risk. To put significant resources year-after-year into a problem that had so successfully resisted the best efforts of the scientific community can be a gutsy decision on the part of manager. The authors believe that we have justified our managers' faith in us.Among the managers who should be recognized are

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Section: Introductionmentioning

confidence: 99%

Handbook on dynamics of jointed structures.

Ames¹,

Lauffer²,

Jew³

et al. 2009

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“…Numerous studies, based on experimental and digital tests, have been conducted to investigate local behaviour at the thread root [8,14] to define the fatigue resistance and evaluate the maximum stress taking into consideration the probability of local plastification. However, the main objective remains the equivalent local stiffness of the portion of the bolt engaged in the tapped hole (see Fig.…”

Section: Stiffness Of a Tapped Partmentioning

confidence: 99%

“…In this framework, Wileman et al [6] considered the washer as a rigid body in simulating the interaction between the head of the bolt and the part. Unfortunately, this approach appeared to be irrealistic and inaccurate as shown by Guillot [3], Massol [7] and Zadoks [8]. Lehnhoff et al [5,9,10] calculated an average equivalent displacement for the nodes at the contact zone to simulate this interaction.…”

Section: Introductionmentioning

confidence: 98%

Equivalent axial stiffness of various components in bolted joints subjected to axial loading

Alkatan¹,

Stéphan²,

Daidié³

et al. 2007

Finite Elements in Analysis and Design

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“…Very few studies show that researchers have modeled the thread run-out region or the transition zone between the threads and the bolt shank to create a full 3D model of the bolt. One approach is to model the bolt body and the threads separately and then connect them together using contact elements to allow appropriate load transfer as done by Zadokas and Kokatam [11] and Zhang et al [12]. Another approach used by Huang and Guo [13] was to create the model with transition elements between the bolt body and the threads using pyramid elements eliminating the use of contact elements between the two zones.…”

Section: Introductionmentioning

confidence: 98%

Finite Element Simulation of Process Control for Bolt Tightening in Joints With Nonparallel Contact

Ganeshmurthy

Nassar

2014

Journal of Manufacturing Science and Engineering

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In this paper, 3D finite element analysis (FFA) is used to simulate and evaluate different process control methods that are commonly used for automating the assembly of bolted joints in a mass production environment. The finite element (FF) model takes into account the thread helix angle of a fastener along with parallel and nonparallel contact surfaces under the bolt head. Simulation includes the torque-only and the torque-turn process control methods for achieving a desired level of the bolt preload at initial assembly of the joint. The torque-only process control option is simulated by applying the target torque at which the tightening process is automatically stopped. On the other hand, a torque-turn or torque-angle method is simulated by first applying a low level (threshold) torque, to the bolt head, followed by turning the bolt head by a specified angle of turn in order to achieve the desired bolt tension. The effect of variables such as thread and underhead bearing friction coefficients and bolt hole clearance is investigated. The FEA simulation provided in this study would be helpful in developing a reliable tightening strategy for joints with nonparallel bearing surfaces.

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Investigation of the Axial Stiffness of a Bolt Using a Three-Dimensional Finite Element Model

Cited by 20 publications

References 2 publications

Handbook on dynamics of jointed structures.

Handbook on dynamics of jointed structures.

Equivalent axial stiffness of various components in bolted joints subjected to axial loading

Finite Element Simulation of Process Control for Bolt Tightening in Joints With Nonparallel Contact

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